The granularity and fuzziness on the outside surprised me a bit, but I definitely like it. A lot of the lines seem sharp but unfocused at the same time, it's neat. The only little thing I noticed was that parts of the blue/white line at the top left look a little jagged like it needs to be anti-aliased or something.
That most complex circle looks very 3-dimensional, and almost seems to have a living form inside of it. See that white eye towards the top-right of the brown tangles? Very interesting, although the white background seems kind of plain and harsh to me. Perhaps I'd like if there were more lines on the outside like you have added already, drawing further attention to that central feature (which I really do like).
In any case, I don't know much about art, but at least it isn't an anime drawing.
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